Internal-combustion engine.



No. 8727.336. PATENTED DEG.3,19o'/..

. L. T. GINES.

INTERNAL coMEUsToN ENGINE.

APPLIOATION FILED MAY 2, 1906.

'- gases to effect or facilitate the introduction LUCIVUS T. GIBBS, OF HEMSTEAD, NEW YORK.

INTERNAL-COMBUSTION ENGINE.

l Specication of Letters Patent.

Patented nec. a, 1907.

Application led May 2 1906. Serial No. 314.742.

To all whom 'it may concern:

Be it known that I, Lucius T. GIBBs, a citizen of the United States, residing at Hempstead, Long sland, in the State of New York, have invented certain new and useful Improvements in Internal-Combustion Engines, of which the followin is a speciiication, reference being had to tie accompanying drawing, forming a part hereof.

- This invention relates to internal combustion engines of the two-cycle type in which an exhaust port of the working cylinder is opened as the piston approaches the forward limit ofits stroke and an inlet port for the fresh char re is opened at the same time or immediate y thereafter. of such engines, as ordinarily constructed, it usually happens either that the burned gases are insuilicie'ntly cleared out of the working lcylinder or that more or less of the new charge is wasted in expelling the. burned gases. ln either case the efficiency of the engine suers.l v l By the present invention it has been sought to provide, in engines of the t ferred to, means for more eHectively c caring out the burned gases after each explosion without wasteof the fresh charge. In attaining this object alvacuum chamber, that 1s, a means whereby the pressure is reduced, is connected with the working cylinder through a valve which is opened at the i proper instant in order that the burned gases may be drawn out of the working cylinder,

the exhaust port bein closed meanwhile, so that th' burned gases a ready expelled are not d ra'wn back into the cylinder. sidlary exhaust valve, moreover, is so located, preferably in the head of the cylinder, asito cause the withdrawal of the burned of the fresh charge behind them. The in vention will be more fully explained hereinafterl with reference to the accompanying drawin which represents, partly in elevation an partly in vertical section, vand more or less diagrammatically, an en ine to which the resent improvement is app ied. l

T e engine represented inthe drawin comprises, as usual, a cylinder a provide4 with an exhaust port a and an inlet port 0.2,*

both of which are adapted to be uncovered,

the exhaust portslightly in advance of the' inlet ort, by the trunk piston `b as -it approac es the limit ,of its-forward stroke.

he piston is connected, as usual, by-the In the operationk The subpitman c, with the usual crank shaft d. A carbureter e of ordinary construction is represented as connected with the inlet port a, so that the explosive charge shall be formed and introduced into the cylinder as the inlet port a is opened. The piston b is provided with a pro'ecting lip f, having an aperture f in line wit port a', so thatv as the piston alpproaches the limit of its forward stroke t e exhaust port a first communicates with the interior of the cylinder through the port or aperture f and is then closed by the lip. At a suitable point inthe cylinder, preferably in the headthereof, is provided a subsidiary -valve controlled exhaust port g, which communicates with a vacuum chamber. As sh'own, the port communicates with a vacuum tank h whic' is in turn connected with a vacuum pump i o erated by an eccentric 7c on the shaft d. T 1e port g is controlled by an inwardly opening valve l which is opened at the proper instant by any suitable means. As shown, the valve stem -l has applied thereto a spring Zz which holds the valve normally in its closed position, and a 'roller Z3 which 1s'acted upon to open the valve at the required instant by a camm on shaft m which mayl be driven through beveled gears fm2, the s aft n, and beveled gears fn from the crank shaft d.

It will now be understood that in the operation of the engine, a partial vacuum having beenestablished in the tank h the piston b, as itz approaches the forward lim1t of its stroke, st opens the exhaust port a. permitting the burned gases in the cylinder to escape under their own pressure. The' continued forward movement of the piston then closes the exhaust port a through the action of the lip andopens the inlet ort a.3 permittin t e entrance of the esh charge throng the establishment in the cylinder of a partial vacuum, through the opening at that instant of the subsidiary exhaust port g.

A Iprtial vacuum being maintained 1n thefj. tan

h, burned gases which remain in the cylinder are immediately drawn out of the? same and, the pressure in the cylinder being thereby reduced, the freshcharge is into the cylinder through 'the inlet ort, following the The valve l should remain open long `enough not only to insure the removal of the greater portion of the burned gases from the cylinder ut to insure also the llig of the same with the fresh charge.` Thistakes place while the burned gases vin their wit drawal.

an portion of the ai'.

vio

exhaust port a is closed by the ff The exhaust port is again o ened las the piston begins its rearward stro e, but as the pressure inl the cylinder is then substantially atmosphericthere is ractically noesca e of fesh charge throug the ust port.

It will be obvious that the subsidiary exhaust port may be located otherwise than as,

shown and that the vacuum may-be maintained and the valve operated by anyv suitable means, as Well as that -the construction of the engine in other respects may be of. any suitable character, other than as shown in the drawing.

l claim as my invention- 1f; In an internal combustion engine, the combination of a cylinder, a piston, said cylinder having inlet and exhaust orts uncovered by the piston as itapproac es the limit of its forward stroke, the piston having an apertured' lip whereby the exhaust port after being o ened, is closed during the continued forwar movement of the piston, and means to withdraw the burned gases from the c linder while the exhaust port is `closed an` the,

inlet ort is opened.

2. n an internal combustionvengin'e, Athe combination of a cylinder, a piston, the cylinder having inlet and exhaust orts uncovered by the piston las it approac es the limit of its forward stroke, a subsidiary exhaust port independent of the main exhaust port,

means to close the main -exhaust port after it has been opened during thecontinued forward movement of the istonfa valve to control the subsidia e aust port, means to i -open said valve-w 'le the mam exhaust port is closed, and a vacuum chamber connected with said subsidia exhaust port.- y

3. In an interna combustion engine, the

combination of a cylinder, a piston,; the cyl- 'inder having inlet.; and exhaust orts uncovered by the piston as it approac es the limitv of its forwardy stroke and a subsidiary exhaust port, the piston having an apertured lip to close the main exhaust port after the same is opened in the continued forwardv movement of the piston, a valve to control the subsidiary exhaust port, means to open said valve while the main exhaust port is closed and a vacuum chamber connected with the subsidiary exhaust port.

4. In an internal comlustlon engine, the combination of a cylinder, a piston, the cylinder having inlet and exhaust ports, means whereby said ports are opened as the piston ap roaches the forward hmit of its stroke, a su sidiary exhaust port at the head end of the cylinder, a valve for controlling said subsidiary exhaust port, means for operating said valve to open said subsidiary exhaust ort as the piston approaches the forward 'mit of its stroke, an

connected with the subsidiary exhaust port.

5. In van internal combustion engine, the combination of a cylinder, a piston, the cylinder having linletand exhaust ports, means whereby said ports are 'olpned as the piston ap roaches the forward 'tof its stroke, a su sidia exhaust-port at the head end of the cylin er, a valve for controlling said sub-l sidiary exhaust port, 'means for operating said valve to open saidsubsidiary exhaust ort as the. piston kapproaches the forward haust port is closed, and a vacuum chamber connected with the subsidiary exhaust port.

a vacuum chamber imits of its stroke and While the' main ex- .l 

